Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc36bcf75f47b63…

MALICIOUS

PDF

127.8 KB Created: 2021-08-06 07:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: cb8f858e19582733d382e8f73104f588 SHA-1: e0dde048441930cd37f77d5cccc051d328f19150 SHA-256: 8cc36bcf75f47b63466212c8b53be7755fb35742a3f141b62eb356fcc71b0edf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to lead the user to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://nutronicltd.com/userfiles/file/44006812017.pdf In PDF document text
    • https://huanghecables.com/d/files/tawopotifipitodogu.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/rulizegupumimujaxe.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/83525995872.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608183288c099---pefaturolomalofebaduka.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a77236d2---30235457617.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1c5c7b42f5dd65a84a24827015a766d9/pufozavigebitagovilufag.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/47943812659.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8482999da4---bukoxaronamaxipesogebuxi.pdfIn PDF document text
    • http://clingac.com/d/files/gagurodufuwenixunizaka.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607322056e382---kelugigib.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4276012028f164b0160f0e3afbd8a1e4/9321627180.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/14865e1c2626cfbdd642637f71f9d4b2/70115625837.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/21dd43fb8993d450dcb91bdc58bd7a7b/569736864.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0022de55f---kuwedajefikafades.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/37db8c6e6de421f0920040fb012d388b/lumugamuwimexuzizugat.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/96394154104.pdfIn PDF document text
    • http://splogservice.ru/content/file/nabogexuji.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/xivugofipexak.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/70654764326.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/bepodo.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/60917904385.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/94983561614.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/fabataxagowutavekeminutu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62491744524.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/6198386045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apostila+de+massoterapia+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6DA 20680 bytes
SHA-256: 2daf322f6097bb70da27c97c0b70ec8c9c383036bc0d255905cdc6de23911682
font_02_sfnt_off0001d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D83D 10536 bytes
SHA-256: 7fc986963edccbe6b2778859b89cdb435ff0598c5df197d0272e999ecb8cf840

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